jMonkeyEngine is a game development suite made especially for game developers who want to create 3D games with modern technology standards. The software is programmed entirely in Java, intended for wide accessibility and quick deployment.
Developer of 3079 here --
My game wouldn't have existed if it wasn't for this engine. This engine has done so many great things for me, and knowing it is purely Java based allows it to be completely cross-platform without any extra work. Did I mention it is free?
These guys deserve tons of credit. This engine is fast and full of features. It also includes a complete Software Development Kit with terrain editors and all sorts of gizmos.
Highly recommend this!
In response to other review comments:
* This engine does have the ability to determine mouse pointer position. How else did I do my inventory screen?
* This engine can do any type of 3D game, not just "Minecraft clones". Check out the jMonkeyEngine's site for more examples of what has been done by this engine.